Mitsubishi PLK-E03BT Technical Manual page 43

Bad condition
4.
Thread tail from
needle is too
Upper thread tension release
long after
trimming
Tread guide is in wrong position
Trimmer function is canceled
5.
Skip stitching happens at trimming
Trimming is not
Trimmer solenoid is out of order
functioned
Needle and shuttle hook timing is
6.
Skip stitching
often happens
Upper thread tension is not tight
Thread tension regulator's discs
7.
Stitch forming is
loose
Needle and shuttle hook is in wrong
Cables wiring is disconnected
8.
Sewing
System software is not loaded
machine does
not work even
Emergency stop switch is kept
start switch is
turned ON
9.
Work holder height is too high
Sewing
machine runs
idle at high
speed when
power switch is
turned ON
Cause
Pre-tension is too loose
Trimmer timing is delayed
timing is too fast
Fixed knife is dull
Trimmer timing is wrong
Needle and shuttle hook
clearance is too big
not correct
Needle is bent
Needle is bent by driver
Needle is in wrong position
enough
are opened during sewing
Driver and shuttle hook
clearance is very small
ON
Start switch is out of order
Foot switch is out of order
Remedy
Make pre-tension tighter
Adjust trimmer cam position
Adjust synchronizer position
Delay tension release timing
Adjust thread guide position
properly
Resume trimmer function
Change it new knife
Fix skip stitching
Change trimmer solenoid
Adjust trimmer cam position
Adjust synchronizer position
Adjust needle and shuttle
hook timing properly
Adjust needle and shuttle
hook timing properly
Change it new needle
Adjust needle and diver
clearance properly
Amend needle position
Increase upper thread tension
Adjust tension regulator
position properly
Adjust upper tension release
position properly
Adjust needle and shuttle
hook position
Adjust clearance between
driver and shuttle hook
Connect all cables precisely
Load system software to
control box
Release emergency stop
switch lock
Change it new start switch
Adjust work holder height
Change foot switch
－38－
Ref. page
& Item
7-14
7-9
7-17
Control unit
7-5
Control unit
7-11
7-11
----
7-9
7-17
7-3
7-2
5-2
7-4
5-2
6-3(2)
7-16
7-16
7-2
----
3
5-1
6-1
3-7
7-8
3-7